Subqueries Courses
Great Learning via YouTube Intermediate SQL
Cybrary From Excel to SQL
LinkedIn Learning Quick Start Guide to SQL
LinkedIn Learning Intermediate SQL for Data Scientists
LinkedIn Learning MySQL Tutorial for Beginners
Programming with Mosh via YouTube Computer Science 204: Database Programming
Study.com Analytics 103: Intro to Relational Databases & SQL
Study.com Introduction to SQL
Study.com Introduction to GROQ Query Language
egghead.io